<snapdata remixID="14893543"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 11.0.8, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><scenes select="1"><scene name="U3L1-ShoppingList_Empty to Students"><notes></notes><hidden></hidden><headers></headers><code></code><blocks><block-definition s="map %&apos;function&apos; over %&apos;lists&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%mult%l"></input></inputs><script><block s="doWarp"><script><block s="doDeclareVariables"><list><l>mapone</l><l>mapmany</l></list></block><block s="doSetVar"><l>mapone</l><block s="reifyScript"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doReport"><block s="reportCONS"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="evaluate"><block var="mapone"/><list><block s="reportCDR"><block var="data"/></block></list></block></block></block></script><list><l>data</l></list></block></block><block s="doSetVar"><l>mapmany</l><block s="reifyScript"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportListItem"><l>1</l><block var="data lists"/></block></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doReport"><block s="reportCONS"><block s="evaluate"><block var="function"/><custom-block s="map %repRing over %mult%l"><block s="reifyReporter"><autolambda><block s="reportListItem"><l>1</l><l/></block></autolambda><list></list></block><list><block var="data lists"/></list></custom-block></block><block s="evaluate"><block var="mapmany"/><list><custom-block s="map %repRing over %mult%l"><block s="reifyReporter"><autolambda><block s="reportCDR"><l/></block></autolambda><list></list></block><list><block var="data lists"/></list></custom-block></list></block></block></block></script><list><l>data lists</l></list></block></block><block s="doIfElse"><custom-block s="empty? %l"><block s="reportCDR"><block var="lists"/></block></custom-block><script><block s="doReport"><block s="evaluate"><block var="mapone"/><list><block s="reportListItem"><l>1</l><block var="lists"/></block></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="mapmany"/><list><block var="lists"/></list></block></block></script></block></script></block></script></block-definition><block-definition s="empty? %&apos;data&apos;" type="predicate" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportVariadicEquals"><list><block var="data"/><block s="reportNewList"><list></list></block></list></block></block></script></block-definition><block-definition s="keep items such that %&apos;pred&apos; from %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%predRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doIfElse"><block s="evaluate"><block var="pred"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><script><block s="doReport"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></block></script><script><block s="doReport"><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></script></block></script></block></script></block-definition><block-definition s="combine with %&apos;function&apos; items of %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="data"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="data"/></block></block></script><list></list></block><block s="doReport"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="combine with %repRing items of %l"><block var="function"/><block s="reportCDR"><block var="data"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; then %&apos;true&apos; else %&apos;false&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%b"></input><input type="%anyUE"></input><input type="%anyUE"></input></inputs><script><block s="doIfElse"><block var="test"/><script><block s="doReport"><block s="evaluate"><block var="true"/><list></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="false"/><list></list></block></block></script></block></script></block-definition><block-definition s="for %&apos;i&apos; = %&apos;start&apos; to %&apos;end&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%n">1</input><input type="%n">10</input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>step</l><l>tester</l></list></block><block s="doIfElse"><block s="reportVariadicGreaterThan"><list><block var="start"/><block var="end"/></list></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicLessThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script><script><block s="doSetVar"><l>step</l><l>1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicGreaterThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script></block><block s="doSetVar"><l>i</l><block var="start"/></block><block s="doUntil"><block s="evaluate"><block var="tester"/><list></list></block><script><block s="doRun"><block var="action"/><list></list></block><block s="doChangeVar"><l>i</l><block var="step"/></block></script></block></script></block-definition><block-definition s="join words %&apos;words&apos;" 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